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There was no point in dominating the game because it was the goal that decided the points so Porto were very fortunate to score at the end and this really hurt Arsenal as they were hoping to hold on for a draw but they couldn't anticipate it properly.
Although this is not a crushing defeat, the chances at Emirates Stadium are still very big, whatever their game will definitely be more attacking than defending because the only way to win, on the other hand my prediction is that Porto will still rely on defense and take advantage of counterattacks because it is certain that Arsenal will master the whole game.
Most likely Porto will use a defensive strategy and target a draw at the Emirates, Arsenal will have difficulty beating Porto even though the goal margin is only 1-0. On paper Arsenal chances were very good, but when they dominated the match and created chances, no one could convert them into goals. Porto would really benefit if Arsenal still played with the same style, they also wanted to qualify for the quarter finals and Arsenal failed to anticipate their style of play.
Arteta seemed very disappointed with the results his team got. It was reported that Arteta criticized his squad and Porto playing style as a result of this defeat. Dominating the match will not always result in victory, Arteta had to change his strategy in the second round. There is no point in criticizing Porto playing style, it will not change the situation at all, the most important thing going forward is how to turn things around. Arsenal chance of winning at the Emirates is quite big, but Porto cannot be underestimated a second time.